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I'm glad it wasn't just me. Google says probably a Cessna F406 Caravan (the Met) or a Britten-Norman Islander (spooks flying from RAF Northolt). Actually there's even a thread about it:
https://www.lfgss.com/conversations/268006/
Fox
@BlackMath
I heard that, low rumbling sound. I had no idea what it was.
My girlfriend thought there was thunder.